diff --git a/tests/.copyright.tmpl b/tests/.copyright.tmpl
index 1eb2340..ecbed6c 100644
--- a/tests/.copyright.tmpl
+++ b/tests/.copyright.tmpl
@@ -1,2 +1 @@
 Copyright ${years} ${owner}.
-See LICENSE file for licensing details
diff --git a/tests/integration/test_contour.py b/tests/integration/test_contour.py
index 0f5e71d..807a088 100644
--- a/tests/integration/test_contour.py
+++ b/tests/integration/test_contour.py
@@ -1,6 +1,5 @@
 #
 # Copyright 2024 Canonical, Ltd.
-# See LICENSE file for licensing details
 #
 import json
 import logging
diff --git a/tests/sanity/test_rock.py b/tests/sanity/test_rock.py
index fd3ba17..b73e8ac 100644
--- a/tests/sanity/test_rock.py
+++ b/tests/sanity/test_rock.py
@@ -1,6 +1,5 @@
 #
 # Copyright 2024 Canonical, Ltd.
-# See LICENSE file for licensing details
 #
 import os
 import subprocess
diff --git a/tests/tox.ini b/tests/tox.ini
index a038b15..0c820eb 100644
--- a/tests/tox.ini
+++ b/tests/tox.ini
@@ -15,22 +15,24 @@ pass_env =
 description = Apply coding style standards to code
 deps = -r {tox_root}/requirements-dev.txt
 commands =
-    licenseheaders -t {tox_root}/.copyright.tmpl -cy -o 'Canonical, Ltd' -d {tox_root}
-    isort {tox_root} --profile=black
-    black {tox_root}
+    licenseheaders -t {tox_root}/.copyright.tmpl -cy -o 'Canonical, Ltd' -d {tox_root}/sanity
+    licenseheaders -t {tox_root}/.copyright.tmpl -cy -o 'Canonical, Ltd' -d {tox_root}/integration
+    isort {tox_root}/sanity {tox_root}/integration --profile=black
+    black {tox_root}/sanity {tox_root}/integration
 
 [testenv:lint]
 description = Check code against coding style standards
 deps = -r {tox_root}/requirements-dev.txt
 commands =
-    codespell {tox_root} --skip=".tox"
-    flake8 {tox_root}
-    licenseheaders -t {tox_root}/.copyright.tmpl -cy -o 'Canonical, Ltd' -d {tox_root} --dry
-    isort {tox_root} --profile=black --check
-    black {tox_root} --check --diff
+    codespell {tox_root}/sanity {tox_root}/integration
+    flake8 {tox_root}/sanity {tox_root}/integration
+    licenseheaders -t {tox_root}/.copyright.tmpl -cy -o 'Canonical, Ltd' -d {tox_root}/sanity --dry
+    licenseheaders -t {tox_root}/.copyright.tmpl -cy -o 'Canonical, Ltd' -d {tox_root}/integration --dry
+    isort {tox_root}/sanity {tox_root}/integration --profile=black --check
+    black {tox_root}/sanity {tox_root}/integration --check --diff
 
 [testenv:sanity]
-description = Run integration tests
+description = Run sanity tests
 deps =
     -r {tox_root}/requirements-test.txt
 commands =
@@ -61,10 +63,11 @@ pass_env =
     TEST_*
     ROCK_*
 
-
 [flake8]
 max-line-length = 120
 select = E,W,F,C,N
-ignore = W503
+# E231: missing whitespace after ':'
+# E231 excluded for false positives in strings and fstrings.
+ignore = W503,E231
 exclude = venv,.git,.tox,.tox_env,.venv,build,dist,*.egg_info
 show-source = true